<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class jQuickForm_Filter_Xss{
    static function applyFilter($data){
        // xss_clean function from Kohana framework 2.3.1
        $data = str_replace(array('&amp;amp;','&amp;lt;','&amp;gt;'), array('&amp;amp;amp;','&amp;amp;lt;','&amp;amp;gt;'), $data);
        $data = preg_replace('/(&amp;#*\w+)[\x00-\x20]+;/u', '$1;', $data);
        $data = preg_replace('/(&amp;#x*[0-9A-F]+);*/iu', '$1;', $data);
        $data = html_entity_decode($data, ENT_COMPAT, 'UTF-8');
        // Remove any attribute starting with "on" or xmlns
        $data = preg_replace('#(&lt;[^&gt;]+?[\x00-\x20"\'])(?:on|xmlns)[^&gt;]*+&gt;#iu', '$1&gt;', $data);
        // Remove javascript: and vbscript: protocols
        $data = preg_replace('#([a-z]*)[\x00-\x20]*=[\x00-\x20]*([`\'"]*)[\x00-\x20]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2nojavascript�', $data);
        $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2novbscript�', $data);
        $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*-moz-binding[\x00-\x20]*:#u', '$1=$2nomozbinding�', $data);
        // Only works in IE: &lt;span style="width: expression(alert('Ping!'));"&gt;&lt;/span&gt;
        $data = preg_replace('#(&lt;[^&gt;]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?expression[\x00-\x20]*\([^&gt;]*+&gt;#i', '$1&gt;', $data);
        $data = preg_replace('#(&lt;[^&gt;]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?behaviour[\x00-\x20]*\([^&gt;]*+&gt;#i', '$1&gt;', $data);
        $data = preg_replace('#(&lt;[^&gt;]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:*[^&gt;]*+&gt;#iu', '$1&gt;', $data);
        // Remove namespaced elements (we do not need them)
        $data = preg_replace('#&lt;/*\w+:\w[^&gt;]*+&gt;#i', '', $data);
        do
        {
            // Remove really unwanted tags
            $old_data = $data;
            $data = preg_replace('#&lt;/*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^&gt;]*+&gt;#i', '', $data);
        }
        while ($old_data !== $data);
        return $data;
    }
}
?>